4. A. Energy is always released Bonds between atoms break and new bonds form. C. The forward reaction happens at the same rate as the reverse reaction. Which statement correctly describes a chemical reaction? Clearly two of these can be eliminated. D. The reaction has stopped until a stress is applied to the system. C. The products have lower potential energy than the reactants, and the ΔH is negative. B. (3) The rate of the forward reaction is less than the rate of the reverse reaction. Chemical reactions are an integral part of technology, of culture, and indeed of life itself.Burning fuels, smelting iron, making glass and pottery, brewing beer, and making wine and cheese are among many examples of activities incorporating chemical reactions that have been known and used for thousands of years. Identify the statement which does not describe the property of alkenes. A. The catalyst increases the concentration of products. (1 point) A catalyst weakens the bonds of the reactants lowering the activation energy. The reaction has stopped because all reactants have been used up. Which statement best describes evidence that a chemical reaction occurs as a cake bakes?A The water in the cake evaporates.B The cake rises as gas bubbles form in the baking cake.C The cake takes the shape of the container in which it is baked.D The water in the cake batter is used to keep the They are unsaturated hydrocarbons. Aug 2002-13 Which statement correctly describes a chemical reaction at equilibrium? The catalyst increases the concentration of reactants. O Reactants come out of a reaction. or D. The products have lower potential energy … They absorb oxygen from the enviornment. The products don't react. A. The catalyst binds to enzymes to release substrates. the rearrangement of atoms by breaking and reforming chemical bonds a reaction that absorbs heat from the surroundings a reaction that releases heat to the surroundings the rearrangement of molecules based on temperature and pressure The reactants are what are "reacting". The products are what is formed. The forward reaction happens slightly faster than the reverse reaction. (2) The concentrations of the products and reactants are constant. Which statement correctly describes a chemical reaction?O Reactants come out of a reaction.O Energy is always released.O Bonds between atoms break and new bonds form.O Products go into a reaction. B. A catalyst strengthens the bonds of the reactants increasing the activation energy. Some reactions appear to be “substitution” of an alkene, but in fact, is the result of an “addition-elimination” sequence of reactions. The products have higher potential energy than the reactants, and the ΔH is negative. Which statement describes a chemical reaction at equilibrium? 10. 2. they provide energy for chemical reactions. Which statement correctly describes what transpires during a chemical reaction? Which statement best describes how a catalyst can speed up a chemical reaction? 1. they control the transport of materials. Which statement describes all enzymes? The products have higher potential energy than the reactants, and the ΔH is positive. (1) The concentrations of the products and reactants are equal. a) Reactant molecules and product molecules have the same velocity. They decolourises bromine water. 3.they affect the rate of chemical reactions. The rearrangement of atoms constitutes a chemical reaction, although some phase changes can also qualify. Which statement correctly describes an endothermic chemical reaction? Products go into a reaction, Mark this and return Save and Exit Sube B. 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